concurrency.md

@@ -210,7 +210,7 @@ expect.
 > performance issue.  It is always correct to make a concurrent
 > call, but it might be more efficient to make a non-concurrent
 > call if the call does not block.  An implementation might
-> implement \*all\* calls as concurrent, for simplicity.
+> implement *all* calls as concurrent, for simplicity.
 >
 >
 
@@ -241,6 +241,7 @@ expect.
 >
 
 
+
 **2.2.** choices for non-reentrant calls:
 
 
@@ -261,6 +262,7 @@ expect.
 >
 
 
+
 **2.3.** should we annotate foreign calls according to whether they need
 to access thread-local state (TLS) or not?